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Also of interest: International Statistics
In May, 2013 the President signed an Executive Order to make government-held data more accessible to the public and to entrepreneurs and others as fuel for innovation, economic growth, and government efficiency. Under the terms of the Executive Order and a new Open Data Policy all newly generated government data will be required to be made available in open, machine-readable formats, greatly enhancing their accessibility and usefulness, while ensuring privacy and security.
Search data archives below for time series or longitudinal study.
This is a customized Google search of 15 key government and academic data sites.